package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author 徐扬文
 * @version 1.0
 */
@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //若存在,则数量+1
        if (list != null && list.size() > 0) {
            ShoppingCart cartService = list.get(0);
            cartService.setNumber(cartService.getNumber() + 1);
            shoppingCartMapper.updateById(cartService);
        } else {
            //不存在,则还需要添加一条购物车数据
            Long dishId = shoppingCart.getDishId();
            if (dishId != null) {
                //添加菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                Long setmealId = shoppingCart.getSetmealId();
                //添加套餐
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     */
    @Override
    public List<ShoppingCart> list() {
        log.info("查看购物车");
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        log.info("清空购物车");
        Long userid = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userid);
    }

    /**
     * 删除购物车一个商品
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        log.info("删除购物车中的一个商品：{}", shoppingCartDTO);
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0) {
            ShoppingCart cartService = list.get(0);
            if (cartService.getNumber() > 1) {
                cartService.setNumber(cartService.getNumber() - 1);
                shoppingCartMapper.updateById(cartService);
            } else {
                shoppingCartMapper.deleteByIdAndUserId(cartService.getId(), BaseContext.getCurrentId());
            }
        }
    }
}
